Automating Linux and Unix System Administration Second Edition phần 8 pptx

... COURSEMost system administrators are familiar with the `ebb and l]p_d commands. The `ebb command is used to compare text files line by line and show the differences. The l]p_d command takes a ... of state on the system, relays the state changes on to other systems via TCP or multicast UDP, listens for and gathers the state of other cikj` daemons in the local cluster, and answers request ... source files.If merging is entirely new to you and you’re still struggling to understand the concepts, you’re not alone. Revision control system tools and concepts are best learned by working with...

... AUTOMATING A NEW SYSTEM INFRASTRUCTURE163Internal NTP MastersWe’ll use our cfengine master host (goldmaster.campin.net) and our Red Hat Kickstart system (rhmaster.campin.net) as the two systems ... to choose Linux over Solaris systems to handle this role. You should find it quite easy to modify this procedure to use one or more Solaris systems to synchronize off site instead, and have ... boots:_dik`311+]+ap_+n_.*`+O55nqjkj_a77ao]__kjbecqnalksani]j]caiajpoa`o+qj_kjbecqna`+jkodqp`ksj++]+ap_+lksan*_kjb:+]+ap_+lksan*_kjb*oa`ir+]+ap_+lksan*_kjb*oa`+]+ap_+lksan*_kjblaniepnkkphkcejkranoodoa`#o+ZLaniepNkkpHkcejjk+LaniepNkkpHkcejuao+#+]+ap_+ood+ood`[_kjbec:X+]+ap_+ood+ood`[_kjbec*oa`ir+]+ap_+ood+ood`[_kjbec*oa`+]+ap_+ood+ood`[_kjbeclnarajplnkilpokjbenop^kkp]^kqplksani]j]caiajpoa`#o+Z?KJOKHA+X?KJOKHA+#+]+ap_+`ab]qhp+hkcej:+]+ap_+`ab]qhp+hkcej*oa`ir+]+ap_+`ab]qhp+hkcej*oa`+]+ap_+`ab]qhp+hkcejlnarajplnkilpokjbenop^kkp]^kqppdaJBO`ki]ejpkq_d+]+ap_+*JBO0ejop[op]pa*`ki]ej_]p:+]+ap_+*ouoe`_kjbec*]llo 88 AKOUO+qon+o^ej+ouoe`jbo0+qon+o^ej+ouoe`li+he^+or_+iapdk`+ood`+qon+he^+__)__n+^ej+an]oa??NNalkoepknuAKOUO_]p:+]+ap_+*ouoE@pkkh*op]pa 88 AKE@P-Ouopailnarekqohu_kjbecqna`;->kkpl]n]iooq__aa`a`;-Ouopaieokj]japskng;-Atpaj`a`japskngejbkni]pekjc]pdana`;-=qpk^ej`anoq__aa`a`;-Japskngd]ooq^japo;-nkkpl]ooskn`lnkilpa`bkn;-hk_]ha]j`panilnkilpa`bkn;-oa_qnepulkhe_uejlh]_arp-,,AKE@PCHAPTER...

... tasks that you might never have considered automating. Automating Linux and Unix System Administration Second Edition Nate Campi and Kirk BauerINTRODUCTIONxxivDownloading the CodeThe ... 380 Other Scripting Languages 382 Perl Resources 383 Basic Regular Expressions 383 Characters 383 Matching Repeating Characters 384 Other Special Characters 385 Marking and Back Referencing 385 grep ... Automating Linux and Unix System Administration, Second Edition Copyright © 2009 by Nate Campi, Kirk BauerAll rights reserved....

... each system by logging in and manually run-ning the _b]cajp command. Cfengine follows a good theory in system- administration automation: the more ways you can initiate changes to a system, ... example to any number of systems. We would recommend, though, that you start out with just two systems. Once you get cfengine up and running on those systems, expanding the system to other hosts ... it handles running _b]cajp and reporting its output. _bgau: Generates public/private key pairs and needs to be run only once on every host. _bnqj: You can run this command from a remote system...

... master, system upgrade, and patching procedures is easy before the systems and procedures are put into use. Once you’ve been deploying and updating systems using automated means, reorganizing and ... odahh_kii]j`o6]hh66+qon+^ej+n`]pa)ojpl-peiakqp9/,na`d]p*Dn,.[M-66+qon+hk_]h+o^ej+hkc[l]_g]cao^]_gcnkqj`9pnqaOn all systems, the n`]pa command is executed to synchronize the system s clock. Cfengine terminates this command in 30 seconds if it has not completed. On systems running Red Hat Linux, a ... run Linux, and the NFS server hosts run Solaris.One of the major goals of this project is to rapidly deploy and configure the systems hosting the site, as well as to deploy application and...

... the `ec command: `ec<ap_dh]ilcs*_]ilej*jap*7 88 ::@eC5*/*0)L-*- 88 ::<ap_dh]ilcs*_]ilej*jap*7$-oanranbkqj`%77chk^]hklpekjo6lnejp_i`77Ckp]josan677)::DA=@AN 88) kl_k`a6MQANU(op]pqo6JKANNKN(e`601.3077bh]co6mn]]n`n]7MQANU6-(=JOSAN6-(=QPDKNEPU6-(=@@EPEKJ=H6-77MQAOPEKJOA?PEKJ67cs*_]ilej*jap*EJ=77=JOSANOA?PEKJ6cs*_]ilej*jap*2,,EJ=-5.*-24*-*-77=QPDKNEPUOA?PEKJ6_]ilej*jap*2,,EJJOap_dh]il*_]ilej*jap*77=@@EPEKJ=HOA?PEKJ6ap_dh]il*_]ilej*jap*2,,EJ=-5.*-24*-*./577Mqanupeia6-5ioa_77OANRAN6-5.*-24*-*./51/$-5.*-24*-*./5%77SDAJ6PqaFqh.5-3601605.,,477IOCOEVAn_r`642This ... `ec<ap_dh]ilcs*_]ilej*jap7 88 ::@eC5*/*0)L-*- 88 ::<ap_dh]ilcs*_]ilej*jap7$-oanranbkqj`%77chk^]hklpekjo6lnejp_i`77Ckp]josan677)::DA=@AN 88) kl_k`a6MQANU(op]pqo6JKANNKN(e`61533577bh]co6mn]]n`n]7MQANU6-(=JOSAN6-(=QPDKNEPU6-(=@@EPEKJ=H6-77MQAOPEKJOA?PEKJ67cs*_]ilej*jap*EJ=77=JOSANOA?PEKJ6cs*_]ilej*jap*2,,EJ=-5.*-24*-*-77=QPDKNEPUOA?PEKJ6_]ilej*jap*2,,EJJOap_dh]il*_]ilej*jap*CHAPTER ... the host aurora and inspect the new +ap_+naokhr*_kjb:CHAPTER 7 ฀ AUTOMATING A NEW SYSTEM INFRASTRUCTURE165Create the file +r]n+jpl+jpl*`nebp as nkkp using the pkq_d command, and enable the...

... applications and data from mul-tiple systems. You can modify the files on any system, and the changes become instantly available on all other systems.Problems with network filesystems begin ... Managing NFS and NIS, Second Edition by Hal Stern, Mike Eisler, and Ricardo Labiaga (O’Reilly Media Inc., 2001).The biggest disadvantage of NFS is that it relies on the network and a single ... client systems inoperable.With NFS, a user should have the same user ID on all systems. All file ownership on an NFS filesystem—well, any filesystem, really—is assigned by user IDs (UIDs) and...

... has bugs; and all manner of issues crop up that cause hosts and applications to fail. System and service monitoring is automation’s com-panion tool, used to notify us when systems and applications ... chapter, and we believe that our choices will scale with your environment as it grows.฀have chosen Nagios for our system and service monitoring system. Nagios is flex-ible and mature, and help ... schedule plug-ins and handle notifications, plug-ins to perform host and service checks, NRPE to run plug-ins on remote hosts, and the Nagios CGI web interface to display status and to interact...

... with Perl as standard software. However, most administrators find that adding Perl to all of their UNIX systems is well worth the effort, and it comes preinstalled on all major Linux distributions. ... very popular in the system administration community and may very well be the most popular scripting language in use today. The major disadvantage is that some com-mercial UNIX variants may not ... bpl6++bpl*_l]j*knc. These modules were contributed by thousands of Perl developers and systems admin-istrators around the world. They can save you a lot of time, and if you upload your own modules, you can...

... expressionscharactersmatching repeating, 384 – 385 overview of, 383 – 384 special, 385 marking and back referencing, 385 – 386 overview of, 383 reload_bind class, 181 Remote Procedure Calls (RPCs), 233remote systemsconfiguring ... Network and System Adminis-tration, Second Edition (Burgess), 6private DNS, setting upBIND configuration automating, 1 78 188 overview of, 172–1 78 overview, 171private keys, trust in cfengine and, ... for, 284 – 285 authentication file, creating, 285 – 286 building Nagios, 280 – 281 building Nagios plug-ins, 281 – 282 building Nagios plug-ins, copying, 291–295copying start-up script, 282 daemon and...